Talked to Harold this afternoon and he recommended the 288/296 hyd. f/tm on a 108 lsa, installed on a 102. This will go in a Camaro that is driven often, and he said power brakes might not work. Wanted to see if anyone had experience with this cam? Thanks for any input!

Chase

I ran it in an 11:1 377 iron-headed SB. I tried it at 106 and 102 intake cl. At 102 intake cl it had about 210psi cranking pressure, 14.5" of vacuum at about a 8-900 rpm idle. Power brakes worked fine in my case, if your static compression is lower than what I had it might drop the vacuum enough to become an issue with your power brakes.

I had a 280H Isky Mega Cam in a 355 with 10.2:1.
280 232 485 108

I had power breaks and power steering.The break pedal was very low at a light.At times I thought it wasn't going to stop,it always did though.

With even more duration in that engine,I don't think the power breaks would have worked.

I think you might have to get an electric vacuum device.
Or,maby have that cam ground on a 110 LSA.

We use a 288/296 HR8 in a 406, no problems with power brakes.

NASTY73Z-

How many cubes and how much compression?

Here is my combo:
3500 pd. 73 Camaro
350, .040 over
10:1 comp.
ProTopline 200cc heads
Performer RPM
650/750 double pumper
1 5/8" headers
2.5" Dr. gas x-pipe, 2.5" Ultra Flo's
Th400, 3000 stall
3.73 gears
26x10.5" ET Streets

I know Harold is a cam genius and I don't doubt his recommendations, it just seems that the 102 lsa seems radical when most run 110+ for streetability. He said it would idle around 900-1000 rpm. I am down for it as long as power brakes work. Maybe I should just do it and find out, huh? Thanks for the help.

Chase graemlins/thumbsup.gif

Chase, the LSA (lobe separation angle) will be 108* as Harold grinds it into that cam and that can't be changed after its ground in. That's the difference in degrees between the center of the intake lobe and the center of the exhaust lobe. This affects overlap and hence idle quality. Less LSA= more overlap=rougher idle, wider LSA=less overlap=smoother idle.
By 102* ICL (intake center line) Harold means that when you degree the cam in when installing it, install the cam with the center line of the intake lobe positioned at 102* ATDC in relation to the piston's TDC. You CAN change the position of the ICL with degree bushings, keways, etc. but the LSA (lobe separation angle) is not able to be changed after the cam is ground.
Two different terms LSA and ICL. It can be confusing sometimes.
LSA refers to the position of the intake and exhaust lobe in relation to each other on the cam.
ICL refers to the position of the intake lobe in relation to the piston's travel when the cam is installed in the motor.

Randy

Just remember that a 350 with that cam is going to produce less vacuum than a 400 with that cam.As will lower compression.